Propeller



NOV. 1, 1938. T KELLEWEAY 2,134,921

PROPELLER Filed Oct. '7, 1937 Inventor I Attorneys Patented Nov. 1, 1938UNITED STATES PATENT OFFICE PROPELLER Theodore Kelleweay, Yonkers, N. Y.

Application October 7, 1937, Serial No. 167,815

1 Claim.

This invention relates to new and useful improvements in propellers forturbines and various other uses.

The principal object of the present invention is to provide a propellerconstructed in such a manner as to increase bearing surface, while atthe same time diminishing resistance and eliminating churning action.

Another important object of the invention is to provide a propellerwherein the edge portions of the propeller blades are constructed insuch a manner as to eliminate resistance and churn.

Other important objects and advantages of the invention will becomeapparent to the reader of the following specification.

In the drawing:

Figure 1 represents a rear elevational view of the propeller.

Figure 2 is a sectional view on line 2--2 of Figure 1.

Figure 3 is a side elevational view of the propeller.

Figure 4 is a cross-section on line 4-4 of Figure 1.

Figure 5 is a cross section on the line 5-5 of Figure 1.

Referring to the drawing, wherein like numerals designate like parts, itcan be seen that numeral 5 denotes the hub having the drive shaft bore 6therethrough.

The propeller is of the screw type and while shown with the blades 1-8,may have three, four, five, or more blades.

As is clearly shown in Figures 4 and 5, which are cross-sectional viewsof the blades, the blades are of arcuate shape, curving rearwardly. Theblades are thickened along their intermediate longitudinal portions, andgradually change from being convex on both sides at their outer ends tobeing flat on their inner sides and convex on their outer sides.

The inner ends of the blades 1-8 individually 5 extend from the hub 5and have the spaces 9 between the same. Both blades curve in a rearwarddirection and each on its rearward side is provided with the dishedformation I0 merging with the cut out portions II in the tail edge ofthe blade. 10 This dishing out and recessing of the blades serves toincrease the bearing surface of the propeller, While at the same timediminishing resistance and eliminating hub vacuum and churn.Furthermore, as is suggested in Figures 4 and 5, the lead- 15 ing edgesof the blades are sharp so as to readily cut through the water.

While the foregoing specification sets forth the invention in specificterms, it is to be understood that numerous changes in the shape, size,and 20 materials may be resorted to without departing from the spiritand scope of the invention as claimed hereinafter.

Having thus described the invention, what is claimed as new is: 25

A propeller comprising a hub, a plurality of blades radiating from thehub, each of said blades being provided with an arcuate-shaped leadingedge and a trailing edge, said trailing edge being provided with aninward extension joining the 30 hub on a line tangentially with respectthereto, each of the said blades being provided with a concavity on oneside thereof adjacent the trailing edge of the blade at a point adjacentthe hub and taking in that portion of the trailing edge from 35 wherethe lateral portion extends.

THEODORE KELLEWEAY.

